Cerium Phosphate as a Novel Cocatalyst Promoting NiCo2O4 Nanowire Arrays for Efficient and Robust Electrocatalytic Oxygen Evolution

Wei Gao, Wangyan Gou, Yuanyuan Ma, Renjie Wei, Johnny C. Ho, Yongquan Qu

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Incorporating electrocatalysts with rare earth elements has attracted increasing attention in electrocatalysis because of its effective modulation of their chemical and electronic structures for enhanced catalytic hydrogen and oxygen evolution reactions. Herein, cerium phosphate (CePO4) is demonstrated to be a novel cocatalyst that significantly enhances the OER performance of NiCo2O4 nanowire arrays on Ni foam. The high durability of OER performance over 1000 h and the low overpotential of 281 mV required to maintain a catalytic current density of 20 mA cm-2 can be attributed to the synergetic effect between CePO4 and NiCo2O4. Explicitly, CePO4 as a cocatalyst efficiently tunes the surface states of NiCo2O4 and facilitates water adsorption and the conversion of intermediates, leading to a substantial OER performance enhancement. All results exhibit the potential of integrating CePO4 into NiCo2O4 to improve the water oxidation activity of NiCo2O4 and illustrate wide domains of application by combining rare earth elements into electrocatalysts.

Original languageEnglish
Pages (from-to)5769-5776
Number of pages8
JournalACS Applied Energy Materials
Volume2
Issue number8
DOIs
Publication statusPublished - Aug 26 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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